Molding device



Nov. 4, 1941. E. G. L. GIRARD 2,261,247

' MOLDING DEVICE Y Filed Dec. 31, 1956 3 Shets-Sheet l D /JJ/ :V// I'I W Nov; 4, 1941. E. G. l.. GIRARD MOLDING DEVICE 3 shee'ts-sheet 2 Filed Deo, 5l, 1936 Nov. 4, 1941. E. G. L. GIRARD 3 Sheets-Sheet 5 MOLDING DEVICE Filed Deo. 3l, 1956 /m w @Z j E 5,

Patented`Nov. 4, 1941 UNITED star es Para or Fics...

MoLDlNG Davies;

Emile Gustave Louis Girard; Paris, France Appucation December 31, 1936, serial No. 118,691 In France January 2, V1936:

4 Claims.

floors, the molds used in centering are generally made: of bricks.` which are abandonedv in ther finished work.

It has already been proposed tomoldztubularf parts by using'ahollow deformable' core, such asa ballo'onkinflated with air.` or ai rubber hose whichy may be deformed either by defiation"l thereof" or by submitting same to' a traction effort;

It may readily be seen that such a method' can be carried out only in connection with objects-having a-particular shape, such as tubular parts or'the like- The. object of the present invention' isA to provideI a molding device which obviates the` above mentioned drawbacks.

According" tothe essential feature of the in-l vention, the mold, consistingof rigid elements, is usedin combination witha layer of a suitable elastic or plastic matter, such as common orv spongy' rubber, or the like, which is inserted either between one or several outer faces of the mold and the moldedV material, or betweenl twovelements of the mold.

Thissheetv or layer ofv plastic material is so arranged withrrespect to the mold elements that it permits, owing to its deformation, of taking the mold to pieces and withdrawing it.

Several preferred embodiments of my invention will be hereinafter described with reference to the accompanying drawings, in which like reference characteristics refer to like parts throughout:

Fig. 1 is a transverse section of a mold according to the invention as applied to the construction of a floor;

Fig. 2 is a section on line II-II ofv Fig. 1;

Fig. 3 is a section on line III-III of Fig. 1;

Figs. 4 and 5 show other embodiments of Fig- 1 in which an adjustable mold is used;

Figs. 6 and 7 show, on a larger scale, another embodimentof an adjustable mold-in perspective and in section respectively;

Figs` and 9 show the invention `aslapplie'd tothe construction of a canal made off. stone, Fig.v 8=being a transverse section and Fig. 9 ai section on a larger scale on line VII-VII Fig. 8.

In=the embodiment shown in Figs; 1 to 3, the invention-is-shown as applied'to a iioor in which the'bottom' and topportions consist' of a layer ofconcrete o1' of brickswA; andwhich comprises reinforced concreteribs B. 'Ihe free spaces/D between the various ribs B are'obtained in the known manner in using an appropriate mold Instead of being' in direct contact with the V-ibrated concrete; the four faces of the mold,

whiclrforv instancemay bemade'of wood; are' lined with sheets F of an'elastic material. such as defined hereabove. After molding of the concrete and proper hardening thereof, either'under normal setting or by vibration, the elastic bands or sheets- F may be; removed by pullingr same through a hopper G provided inthe upper or lower por# tion ofthe floor. y f

After removal ofthe elastic. bands, a hollow space is formed between the: moldE and the concrete walls whereby the moldrmay be. freely moved' along passage D. The 'rigid mold ispreferably formed by a` seriesA of interconnected; caissons E, E', E", etc. These various elements' may" be dismantled in sections and removed either` through the. hopper G orV through the' opposite portion. I-I, and may-thus be used again.

It vis to be noted: that the system according to my' invention may be' used inv combinationV withthe method/in which the moldi proper vconsists ofa flexible, armouredrubberhose providedr with hoops such as to permit longitudinal deformation:thereof.` Due to the'A elasticity of a` mold of this type the same can readily be removed as a whole through the hopper G or the like.

Fig. 4 is another embodiment of the invention showing a ceiling made of hollow bricks which may be set in place after removal of the oor section of the mold. In4 this case, the mold E, of which the faces in contact with the concrete are likewise covered with a layer or band of plastic material F, may comprise several elements mounted for pivotal movement to each other, so that the mold may be dismantled by rotation of the vertical .element E1 about hinges I which connect the horizontal element E2 to E1.

The relative displacements of these parts determine a deformation of the elastic lining material F, so that the molds may be removed without any diiiiculty, even in that case where bricks, such as J, beneath the ribs B should protrude beyond the vertical faces of the layers K. After dismantling of the mold, the ceiling may be nished in the usual manner by the laying of bricks L carried upon the bricks J interposed between the concrete and supports K.

Fig. 5 shows another embodiment of my inventionl in which the outer layer F may be omitted, a bloc F1 being substituted which may be inserted either between the two elements E1-Ez, or between elements E1 and their supporting base. The plastic bloc F1 reacts in a, manner similar to that hereabove described, and it may be removed by traction, or it may be simply deformed so as to permit dismantlingl of the mold.

In the embodiment shown by Figs. 6 and 7, the

mold consists of three sheet iron elements E1, E1 l and E2 which are mounted for pivotal movement about two axes I and I', the edges of two adjoining elements being bent over in ab so as to form abutting flanges. The transverse rigidity of the caisson thus formed is realized by means of cross braces which are secured in place by a suitable pin connection.

At their lower ends the lateral sections E1, E1 are accurately spaced and securely held in position by means of angle irons d provided within the mold and which are carried by the elastic blocs F1. These blocs, which are secured upon the lower portion of plates E1 act in a manner similar to that described hereabove.

The blocs F1 are connected to the lower edges e1 and e'1 of sheets E1 and Efi; to this effect the lower edges of the sheets are firstly folded over at right angle and a second time about 180 such as to form a bead which eventually prevents sliding movement of the elastic bloc.

It is well understood that the invention does not exclusively relate to floor constructions, but may as well be used in connection with any work requiring the use of a mold. Figs. 8 and 9 thus show the invention as applied .to the construction of a canal built of stones.

The centering or false work in this construction likewise comprises la rigid part (formed e. g. of several elements E1, E2 arranged for pivotal movement about l), lined with one or several layers of elastic material F.

After the stone work M of the canal has been finished in the usual manner, the centering may be dismantledl either in swinging the elements E1, E2 about pivot I, or by direct removal of the elastic material'F. Fig. 9 shows more specifically in what manner the iiattening out of the matter F takes place under the pulling effort exerted in the direction of the arrow f producing the free space required for effecting the removal.

While I have shown preferred embodiments of my invention it is to be understood that I do not confine myself to the precise details of construction herein set forth by way of illustration as is apparent that my invention may as well be used in connection with any other kind of construction, and that the elastic material may be realized in many different ways. Furthermore, instead of rubber sheets, it is understood that a solid material may be used, in which cavities, cells or channels are provided which are arranged to permit of being successively inflated or deflated by means of an appropriate element such as water, air, or the like.

What I claim as new and desire to secure by Letters Patent of the United States is:

1. In combination in a molding device, a rigid support provided with at least one bearing surface, a mold having at least two mold sections hinged to each other and adapted to form the carcass of the mold, and intermediate resilient means inserted between one of said mold sections and said bearing surface.

2. For use in connection with a rigid stationary structure provided with at least one horizontal bearing surface, a molding device which comprises, in combination, at least two mold sections hinged to each other at their top parts about a substantially horizontal line and adapted to form the walls of the mold and at least one intermediate rubber band inserted between the lower face of one of said mold sections and said bearing surface of the stationary structure, whereby deformation and removal of said band permits of reciprocal pivoting movement of said mold sections and removing of the whole from said stationary structure.

3. For use in connection with a rigid stationary structure including a series of substantially horizontally disposed parallel supports a molding device which comprises, in combination, at least two mold sections forming lateral mold walls, said mold sections being interconnected at the top so that they can pivot on an arcuate path in the direction of said supports, and one band of resilient material inserted between the lower edge of each of said mold sections and the corresponding support, so that said molding device bears on said rigid structure through said resilient bands, whereby deformation and removal of said bands permits of reciprocal pivoting movement of said mold sections toward each other and removing the whole from said rigid structure.

4. The arrangement claimed in claim 2, in which the molding device comprises two mold sections forming the lateral walls, and a third mold section hingedly connected to said wall sections and forming the top wall of the mold.

EMILE GUSTAVE LOUIS GIRARD. 

